US6771592B1 - Voice and data wireless communication system with improved error recovery - Google Patents
Voice and data wireless communication system with improved error recovery Download PDFInfo
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- US6771592B1 US6771592B1 US09/705,663 US70566300A US6771592B1 US 6771592 B1 US6771592 B1 US 6771592B1 US 70566300 A US70566300 A US 70566300A US 6771592 B1 US6771592 B1 US 6771592B1
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- 238000011084 recovery Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000007704 transition Effects 0.000 abstract description 5
- 230000011664 signaling Effects 0.000 description 2
- 230000010267 cellular communication Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/64—Hybrid switching systems
- H04L12/6418—Hybrid transport
Definitions
- the present invention relates to communications; more specifically, wireless communications.
- communication channels were used to communicate both speech and data related information from a transmitter to a receiver.
- the communication channel When in the first mode, the communication channel carried speech information and when in a second mode the communication channel carried data information.
- the transition from speech to data mode or from data to speech mode was indicated through the use of one or more control words. Unfortunately, if the control word was missed or misinterpreted, a receiver would not detect this transition between modes.
- the present invention provides a method for detecting and recovering from missed control words that signify a transition to or from a speech mode to a data mode or from a data mode to a speech mode in a communication channel.
- speech information is checked for errors. If an error is detected, the next frame or segment of information is assumed to be data information.
- the data information is examined for valid information such as a valid header. If a valid header is detected, data mode is assumed and if a valid header is not detected, speech mode is assumed.
- FIG. 1 illustrates the structure of a communication channel.
- FIG. 1 illustrates a communication channel in a wireless communications system that can transmit in a speech or data mode to a receiver.
- the communication channel is broken into segments or frames of a known duration such as 20 milliseconds.
- the frames are broken into an even portion and an odd portion.
- each 20 millisecond segment or frame 10 is broken into an even and odd portion where the even portion corresponds to the even bits within the frame and the odd portion corresponds to the odd bits within the frame.
- the speech information is divided diagonally across adjacent frames. For example, a block of speech information is divided between even portion 12 of a preceding frame 10 and odd portion 14 of a subsequent frame 10 .
- the even bits associated with a block of speech data are in a frame immediately preceding the frame containing the odd bits associated with the same block of the speech data.
- control channel information such as information used for handoffs between base stations in a cellular communication system may be used in place of a block of speech data.
- the even bits associated with the control channel block are transmitted in a preceding frame 16 and the odd bits associated with the control channel block are transmitted in the immediately following frame 18 .
- Control channel information is distinguished from speech information through the use of in-band signaling bits.
- the in-band signaling bits are predetermined bits interleaved with the bits carrying speech or control channel information. The bits are used to indicate when a frame contains speech information, control channel information or other types of information needed to maintain communications.
- a control word such as a data mode control word is included in a frame 20 immediately preceding a frame 22 that will contain data information.
- the data mode control word is a predetermined pattern that is readily recognized and distinguishable from typical speech data.
- frames 22 through 24 contain data that may be used to convey information such as packet voice control, messaging information such as e-mail information or paging information, Internet information such as, for example, web page information, or other types of information requested by a user.
- the transition from data mode to speech mode is indicated in a first frame 26 containing speech information by the inclusion of a speech mode control word.
- the speech mode control word is a pattern of bits that is predetermined and unlikely to be seen in typical speech or data information. Once in the speech mode, speech information is diagonally interleaved using even and odd portions spread across consecutive frames as discussed above.
- speech information When in the speech mode, speech information is subjected to an error correction process such as a cyclic redundancy check (CRC) by a receiver. If the check indicates there are no errors, speech mode is continued and the receiver continues to treat the information as speech information. If an error is detected, the next frame is assumed to contain data information. The data information is examined for validity by checking for a known bit pattern such as a valid header. If a valid header is detected; data mode is used to receive subsequent frames of information until a speech mode control word indicates otherwise. If the data information fails the examination and does not contain a known bit pattern such as a valid header, speech mode is continued for subsequent frames of information until a data mode is indicated by a data mode control word or by the above-described process.
- CRC cyclic redundancy check
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Mobile Radio Communication Systems (AREA)
- Communication Control (AREA)
Abstract
A method is provided for detecting and recovering from missed control words that signify a transition to or from a speech mode to a data mode in a communication channel. When in a speech mode, speech information is checked for errors. If an error is detected, the next frame or segment of information is assumed to be data information. The data information is examined for valid information such as a valid header. If a valid header is detected, data mode is assumed and if a valid header is not detected, speech mode is assumed.
Description
1. Field of the Invention
The present invention relates to communications; more specifically, wireless communications.
2. Description of the Related Art
In the past, communication channels were used to communicate both speech and data related information from a transmitter to a receiver. When in the first mode, the communication channel carried speech information and when in a second mode the communication channel carried data information. The transition from speech to data mode or from data to speech mode was indicated through the use of one or more control words. Unfortunately, if the control word was missed or misinterpreted, a receiver would not detect this transition between modes.
The present invention provides a method for detecting and recovering from missed control words that signify a transition to or from a speech mode to a data mode or from a data mode to a speech mode in a communication channel. When in a speech mode, speech information is checked for errors. If an error is detected, the next frame or segment of information is assumed to be data information. The data information is examined for valid information such as a valid header. If a valid header is detected, data mode is assumed and if a valid header is not detected, speech mode is assumed.
FIG. 1 illustrates the structure of a communication channel.
FIG. 1 illustrates a communication channel in a wireless communications system that can transmit in a speech or data mode to a receiver. The communication channel is broken into segments or frames of a known duration such as 20 milliseconds. When in the speech mode, the frames are broken into an even portion and an odd portion. For example, each 20 millisecond segment or frame 10 is broken into an even and odd portion where the even portion corresponds to the even bits within the frame and the odd portion corresponds to the odd bits within the frame. When transmitting speech information, the speech information is divided diagonally across adjacent frames. For example, a block of speech information is divided between even portion 12 of a preceding frame 10 and odd portion 14 of a subsequent frame 10. As a result, the even bits associated with a block of speech data are in a frame immediately preceding the frame containing the odd bits associated with the same block of the speech data.
When in the speech mode, control channel information such as information used for handoffs between base stations in a cellular communication system may be used in place of a block of speech data. As with the blocks of speech data, the even bits associated with the control channel block are transmitted in a preceding frame 16 and the odd bits associated with the control channel block are transmitted in the immediately following frame 18. Control channel information is distinguished from speech information through the use of in-band signaling bits. The in-band signaling bits are predetermined bits interleaved with the bits carrying speech or control channel information. The bits are used to indicate when a frame contains speech information, control channel information or other types of information needed to maintain communications.
When transitioning from a speech mode to a data mode, a control word such as a data mode control word is included in a frame 20 immediately preceding a frame 22 that will contain data information. The data mode control word is a predetermined pattern that is readily recognized and distinguishable from typical speech data. Once in the data mode, frames 22 through 24 contain data that may be used to convey information such as packet voice control, messaging information such as e-mail information or paging information, Internet information such as, for example, web page information, or other types of information requested by a user.
The transition from data mode to speech mode is indicated in a first frame 26 containing speech information by the inclusion of a speech mode control word. The speech mode control word is a pattern of bits that is predetermined and unlikely to be seen in typical speech or data information. Once in the speech mode, speech information is diagonally interleaved using even and odd portions spread across consecutive frames as discussed above.
When in the speech mode, speech information is subjected to an error correction process such as a cyclic redundancy check (CRC) by a receiver. If the check indicates there are no errors, speech mode is continued and the receiver continues to treat the information as speech information. If an error is detected, the next frame is assumed to contain data information. The data information is examined for validity by checking for a known bit pattern such as a valid header. If a valid header is detected; data mode is used to receive subsequent frames of information until a speech mode control word indicates otherwise. If the data information fails the examination and does not contain a known bit pattern such as a valid header, speech mode is continued for subsequent frames of information until a data mode is indicated by a data mode control word or by the above-described process.
Claims (7)
1. A method comprising:
receiving speech related information in a communication frame;
detecting an error in the speech related information;
checking for valid data information in a subsequent communication frame in response to detecting the error;
receiving frames following the checked subsequent communication frame as containing data information if valid data information was detected in the checked subsequent communication frame; and
receiving frames following the checked subsequent communication frame as containing speech related information if valid data information was not detected in the checked subsequent communication frame.
2. A method as claimed in claim 1 , wherein the data information relates to packet voice control information.
3. A method as claimed in claim 1 , wherein the data information relates to messaging information.
4. A method as claimed in claim 3 , wherein the data information relates to e-mail information.
5. A method as claimed in claim 3 , wherein the data information relates to paging information.
6. A method as claimed in claim 3 , wherein the data information relates to Internet information.
7. A method as claimed in claim 6 , wherein the data information relates to web page information.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/705,663 US6771592B1 (en) | 2000-11-03 | 2000-11-03 | Voice and data wireless communication system with improved error recovery |
| EP01304269A EP1204254B1 (en) | 2000-11-03 | 2001-05-14 | Voice and data wireless communication system with improved error recovery |
| DE60104507T DE60104507T2 (en) | 2000-11-03 | 2001-05-14 | Procedures for wireless voice and data transmission with improved debugging |
| JP2001333909A JP3887556B2 (en) | 2000-11-03 | 2001-10-31 | Wireless communication method of voice and data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/705,663 US6771592B1 (en) | 2000-11-03 | 2000-11-03 | Voice and data wireless communication system with improved error recovery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US6771592B1 true US6771592B1 (en) | 2004-08-03 |
Family
ID=24834432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US09/705,663 Expired - Lifetime US6771592B1 (en) | 2000-11-03 | 2000-11-03 | Voice and data wireless communication system with improved error recovery |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6771592B1 (en) |
| EP (1) | EP1204254B1 (en) |
| JP (1) | JP3887556B2 (en) |
| DE (1) | DE60104507T2 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5822315A (en) * | 1994-03-31 | 1998-10-13 | Alcatel Cit | Air interface adapting method for a mobile radio system |
| US5867510A (en) * | 1997-05-30 | 1999-02-02 | Motorola, Inc. | Method of and apparatus for decoding and processing messages |
| US5940405A (en) * | 1995-10-16 | 1999-08-17 | Nec Corporation | High-speed two-way multiplex data communication system and data communication device used therein |
| WO2000045555A1 (en) | 1999-01-28 | 2000-08-03 | Data Race, Inc. | Escape sequence protocol for multiplexing real-time data with non-real-time data |
| US6553065B1 (en) * | 1999-02-04 | 2003-04-22 | Nokia Corporation | Mobile station employing CRC verification using decoding reliability and methods therefor |
-
2000
- 2000-11-03 US US09/705,663 patent/US6771592B1/en not_active Expired - Lifetime
-
2001
- 2001-05-14 EP EP01304269A patent/EP1204254B1/en not_active Expired - Lifetime
- 2001-05-14 DE DE60104507T patent/DE60104507T2/en not_active Expired - Lifetime
- 2001-10-31 JP JP2001333909A patent/JP3887556B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5822315A (en) * | 1994-03-31 | 1998-10-13 | Alcatel Cit | Air interface adapting method for a mobile radio system |
| US5940405A (en) * | 1995-10-16 | 1999-08-17 | Nec Corporation | High-speed two-way multiplex data communication system and data communication device used therein |
| US5867510A (en) * | 1997-05-30 | 1999-02-02 | Motorola, Inc. | Method of and apparatus for decoding and processing messages |
| WO2000045555A1 (en) | 1999-01-28 | 2000-08-03 | Data Race, Inc. | Escape sequence protocol for multiplexing real-time data with non-real-time data |
| US6553065B1 (en) * | 1999-02-04 | 2003-04-22 | Nokia Corporation | Mobile station employing CRC verification using decoding reliability and methods therefor |
Non-Patent Citations (2)
| Title |
|---|
| IBM Technical Disclosure, "Error Control for Voice/Data Packet Network", Dec. 1, 1986, vol. 29, Issue 7, pp 3092-3095.* * |
| Jauregui Acosta et al., "Internet Services on Enhanced CDPD Systems", Jul. 6-8, 1999, Proceedings IEEE International Symposium on Computers and Communications, IEEE Commun. Soc., pp 87-92, 1999. * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE60104507D1 (en) | 2004-09-02 |
| JP2002208987A (en) | 2002-07-26 |
| JP3887556B2 (en) | 2007-02-28 |
| EP1204254A1 (en) | 2002-05-08 |
| DE60104507T2 (en) | 2005-08-04 |
| EP1204254B1 (en) | 2004-07-28 |
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